Matthias Krause, Petr Savický, Ingo Wegener. Approximations by OBDDs and the Variable Ordering Problem. In Jirí Wiedermann, Peter van Emde Boas, Mogens Nielsen, editors, Automata, Languages and Programming, 26th International Colloquium, ICALP 99, Prague, Czech Republic, July 11-15, 1999, Proceedings. Volume 1644 of Lecture Notes in Computer Science, pages 493-502, Springer, 1999. [doi]
Abstract is missing.